Patent US2598968A successfully refreshed from Google Patents.
Patent US4518733A successfully refreshed from Google Patents.
US4518733A
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Rubber compositions comprising (1) polyisoprene (2) cobalt salt of rosin (3) carbon black and (4) sulphur
Assignee: Yokohama Rubber Co Ltd
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Filing: 1984-02-06
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Granted: 1985-05-21
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Expires: 2004-02-06
Abstract
Abstract A rubber composition comprising, in specific mixing ratios, rubber material consisting mainly of natural rubber and/or synthetic polyisoprene rubber, a cobalt salt of rosin, carbon black having specific iodine adsorbability and dibutyl phthalate absorbability, and sulphur.
Inventors
- 👤 Yasuhiro Ishikawa
- 👤 Kazuhiro Yamada
- 👤 Masashi Kida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:02
CPC Classifications
C; C08; C08L; C08L7/00; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
A rubber composition for tires consisting essentially of, by weight, 100 parts of synthetic polyisoprene rubber, 0.02-0.8 parts of a cobalt salt of rosin, calculated as elemental cobalt, 60-100 parts of carbon black having iodine adsorbability of 70-130 mg/g and dibutyl phthalate adsorbability of 50-80 ml/100 g, and 4.5-10 parts of sulfur.
Claim 2
Dependent Claim
52 words
A rubber composition for tires consisting essentially of, by weight, 100 parts of synthetic polyisoprene rubber, 0.02-0.8 parts of a cobalt salt of rosin, calculated as elemental cobalt, 60-100 parts of carbon black having iodine adsorbability of 70-130 mg/g and dibutyl phthalate adsorbability of 50-80 ml/100 g, and 4.5-10 parts of sulfur.
Claim 3
Dependent Claim
35 words
A composition as set forth in claim 1 wherein said cobalt salt of rosin is the product of reacting rosin with an alkali metal hydroxide followed by reacting the resulting rosin compounds with cobalt halide.
Claim 4
Dependent Claim
23 words
A composition as set forth in claim 2 wherein said alkali metal hydroxide is sodium hydroxide and the cobalt halide is cobalt chloride.
Claim 5
Dependent Claim
55 words
A rubber composition for tires comprising, by weight, 100 parts of synthetic polyisoprene rubber, 0.02-0.8 parts of a cobalt salt of rosin as the only organic salt, calculated as elemental cobalt, 60-100 parts of carbon black having iodine adsorbability of 70-130 mg/g and dibutyl phthalate absorbability of 50-80 ml/100 g, and 4.5-10 parts of sulfur.
Claim 6
Dependent Claim
55 words
A rubber composition for tires comprising, by weight, 100 parts of synthetic polyisoprene rubber, 0.02-0.8 parts of a cobalt salt of rosin as the only organic salt, calculated as elemental cobalt, 60-100 parts of carbon black having iodine adsorbability of 70-130 mg/g and dibutyl phthalate absorbability of 50-80 ml/100 g, and 4.5-10 parts of sulfur.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |